Optical imaging lens including eight lenses of +−+++−+−, +−+−+−+−, +−+−−−++, +−+−−−+−, +−+++−−− or +−−−+−+− refractive powers

ABSTRACT

The present invention provides an optical imaging lens. The optical imaging lens comprises eight lens elements positioned in an order from an object side to an image side. Through controlling convex or concave shape of surfaces of the lens elements, the optical imaging lens may shorten system length with a good imaging quality.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.201911326313.5 titled “Optical Imaging Lens,” filed Dec. 20, 2019, withthe State Intellectual Property Office of the People's Republic of China(SIPO).

TECHNICAL FIELD

The present disclosure relates to optical imaging lenses, andparticularly, optical imaging lenses having, in some embodiments, eightlens elements.

BACKGROUND

Recently, as the specifications of optical imaging lenses rapidlyevolve, various factors, such as slim and thin in sizes, smallerf-number (Fno) facilitating enlargement of luminous flux and great fieldof view angle are two trends. For more pixels and better resolution,increasing image height of an optical imaging lens with a bigger imagesensor to receive imaging rays contributed to an image is required.Accordingly, achieving slim and thin in sizes for a short system lengthin view of the various relevant considerations of small f-number, greatfield of view, great image height and presenting good imaging qualitymay be a challenge in the industry.

SUMMARY

The present disclosure provides for optical imaging lenses showing goodimaging quality and being capable to provide a shortened system length,a reduced f-number and/or an enlarged field of view.

In an example embodiment, an optical imaging lens may comprise eightlens elements, hereinafter referred to as first, second, third, fourth,fifth, sixth, seventh and eighth lens elements and positionedsequentially from an object side to an image side along an optical axis.Each of the first, second, third, fourth, fifth, sixth, seventh andeighth lens element may also have an object-side surface facing towardthe object side and allowing imaging rays to pass through. Each of thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselement may also have an image-side surface facing toward the image sideand allowing the imaging rays to pass through.

In the specification, parameters used here are defined as follows: athickness of the first lens element along the optical axis isrepresented by T1, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis is represented by G12, a thickness of the second lenselement along the optical axis is represented by T2, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis is represented by G23,a thickness of the third lens element along the optical axis isrepresented by T3, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis is represented by G34, a thickness of the fourth lenselement along the optical axis is represented by T4, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis is represented by G45,a thickness of the fifth lens element along the optical axis isrepresented by T5, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis is represented by G56, a thickness of the sixth lenselement along the optical axis is represented by T6, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis is represented byG67, a thickness of the seventh lens element along the optical axis isrepresented by T7, a distance from the image-side surface of the seventhlens element to the object-side surface of the eighth lens element alongthe optical axis is represented by G78, a thickness of the eighth lenselement along the optical axis is represented by T8, a distance from theimage-side surface of the eighth lens element to the object-side surfaceof the filtering unit along the optical axis is represented by G8F, athickness of the filtering unit along the optical axis is represented byTTF, a distance from the image-side surface of the filtering unit to theimage plane along the optical axis is represented by GFP, a focal lengthof the first lens element is represented by f1, a focal length of thesecond lens element is represented by f2, a focal length of the thirdlens element is represented by f3, a focal length of the fourth lenselement is represented by f4, a focal length of the fifth lens elementis represented by f5, a focal length of the sixth lens element isrepresented by f6, a focal length of the seventh lens element isrepresented by f7, a focal length of the eighth lens element isrepresented by f8, an refractive index of the first lens element isrepresented by n1, an refractive index of the second lens element isrepresented by n2, an refractive index of the third lens element isrepresented by n3, an refractive index of the fourth lens element isrepresented by n4, an refractive index of the fifth lens element isrepresented by n5, an refractive index of the sixth lens element isrepresented by n6, an refractive index of the seventh lens element isrepresented by n7, an refractive index of the eighth lens element isrepresented by n8, an abbe number of the first lens element isrepresented by V1, an abbe number of the second lens element isrepresented by V2, an abbe number of the third lens element isrepresented by V3, an abbe number of the fourth lens element isrepresented by V4, an abbe number of the fifth lens element isrepresented by V5, an abbe number of the sixth lens element isrepresented by V6, an abbe number of the seventh lens element isrepresented by V7, an abbe number of the eighth lens element isrepresented by V8, an effective focal length of the optical imaging lensis represented by EFL, a distance from the object-side surface of thefirst lens element to the image-side surface of the eighth lens elementalong the optical axis is represented by TL, a distance from theobject-side surface of the first lens element to the image plane alongthe optical axis, i.e. a system length is represented by TTL, a sum ofthe thicknesses of all eight lens elements along the optical axis, i.e.a sum of T1, T2, T3, T4, T5, T6, T7 and T8 is represented by ALT, a sumof seven air gaps from the first lens element to the eighth lens elementalong the optical axis, which is also defined as a sum of a distancefrom the image-side surface of the first lens element to the object-sidesurface of the second lens element along the optical axis, a distancefrom the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis, adistance from the image-side surface of the third lens element to theobject-side surface of the fourth lens element along the optical axis, adistance from the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis, adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axisand a distance from the image-side surface of the seventh lens elementto the object-side surface of the eighth lens element along the opticalaxis, i.e. a sum of G12, G23, G34, G45, G56, G67 and G78 is representedby AAG, a back focal length of the optical imaging lens, which isdefined as the distance from the image-side surface of the eighth lenselement to the image plane along the optical axis, i.e. a sum of G8F,TTF and GFP is represented by BFL, a half field of view of the opticalimaging lens is represented by HFOV, an image height of the opticalimaging lens is represented by ImgH, and a f-number of the opticalimaging lens is represented by Fno.

In an aspect of the present disclosure, in the optical imaging lens, aperiphery region of the object-side surface of the third lens element isconcave and an optical axis region of the image-side surface of thethird lens element is convex, the sixth lens element has negativerefracting power, an optical axis region of the object-side surface ofthe eighth lens element is concave, and lens elements having refractingpower of the optical imaging lens consist of the eight lens elementsdescribed above.

In another aspect of the present disclosure, in the optical imaginglens, a periphery region of the object-side surface of the second lenselement is convex, a periphery region of the object-side surface of thethird lens element is concave and an optical axis region of theimage-side surface of the third lens element is convex, the sixth lenselement has negative refracting power, lens elements having refractingpower of the optical imaging lens consist of the eight lens elementsdescribed above, and the optical imaging lens satisfies:TTL/ImgH≥1.400  Inequality (1).

In another aspect of the present disclosure, in the optical imaginglens, the first lens element has positive refracting power, the secondlens element has negative refracting power and a periphery region of theobject-side surface of the second lens element is convex, an opticalaxis region of the image-side surface of the third lens element isconvex, the sixth lens element has negative refracting power, an opticalaxis region of the object-side surface of the eighth lens element isconcave, and lens elements having refracting power of the opticalimaging lens consist of the eight lens elements described above.

In another example embodiment, other inequality(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example:

V1 + V2 + V6 + V8 ≤ 160.000 Inequality (2); HFOV/TL ≥ 5.200°/mmInequality (3); (T7 + G78 + T8)/(T1 + G12 + T2) ≥ 1.200 Inequality (4);(EFL + BFL)/AAG ≤ 3.700 Inequality (5); ALT/(T2 + T8) ≥ 4.800 Inequality(6); (G45 + G78)/(G23 + G56 + G67) ≥ 1.000 Inequality (7); ALT/(T4 +G45 + T5) ≤ 4.500 Inequality (8); AAG/(T6 + T8) ≤ 4.000 Inequality (9);HFOV/Fno ≥ 20.000° Inequality (10); TL/(G45 + G56 + G78) ≤ 5.300Inequality (11); AAG/(G12 + G23 + G34) ≥ 3.300 Inequality (12); TL/(T1 +T3) ≤ 5.800 Inequality (13); EFL/(T5 + BFL) ≥ 2.000 Inequality (14);EFL/(T1 + T4 + T6) ≥ 2.000 Inequality (15); (EFL + BFL)/(T2 + T7) ≥5.000 Inequality (16); TL/(T5 + G56 + T6) ≤ 6.100 Inequality (17);and/or TL/BFL ≥ 7.000 Inequality (18).

In some example embodiments, more details about the convex or concavesurface structure, refracting power or chosen material etc. could beincorporated for one specific lens element or broadly for a plurality oflens elements to improve the control for the system performance and/orresolution. It is noted that the details listed herein could beincorporated in example embodiments if no inconsistency occurs.

The above example embodiments are not limiting and could be selectivelyincorporated in other embodiments described herein.

The optical imaging lens in example embodiments may achieve good imagingquality, such as good optical characteristics of lower distortionaberration, effectively shorten the system length.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to the present disclosure;

FIG. 2 depicts a cross-sectional view showing the relation between theshape of a portion and the position where a collimated ray meets theoptical axis;

FIG. 3 depicts a cross-sectional view showing a first example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 4 depicts a cross-sectional view showing a second example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 5 depicts a cross-sectional view showing a third example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 6 depicts a cross-sectional view of a first embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 7 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a first embodiment of the opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 9 depicts a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of a second embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a second embodiment of the opticalimaging lens according to the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens of a second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of a third embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a third embodiment of the opticalimaging lens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of a third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of a fourth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a fourth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens of a fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of a fifth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a fifth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of a fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of a sixth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a sixth embodiment of the opticalimaging lens according the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of theoptical imaging lens of a sixth embodiment of the present disclosure;

FIG. 29 depicts a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of a seventh embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a seventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of aseventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of a seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of an eighth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of an eighth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of aneighth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of an eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of a ninth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 39 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of a ninthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 41 depicts a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 42 depicts a cross-sectional view of a tenth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 43 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a tenth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of a tenthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 45 depicts a table of aspherical data of a tenth embodiment of theoptical imaging lens according to the present disclosure;

FIGS. 46A, 46B, 46C and 46D depict tables for the values of TTL/ImgH,V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG,ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8),HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of all tenexample embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons of ordinary skill in the arthaving the benefit of the present disclosure will understand othervariations for implementing embodiments within the scope of the presentdisclosure, including those specific examples described herein. Thedrawings are not limited to specific scale and similar reference numbersare used for representing similar elements. As used in the disclosuresand the appended claims, the terms “example embodiment,” “exemplaryembodiment,” and “present embodiment” do not necessarily refer to asingle embodiment, although it may, and various example embodiments maybe readily combined and interchanged, without departing from the scopeor spirit of the present disclosure. Furthermore, the terminology asused herein is for the purpose of describing example embodiments onlyand is not intended to be a limitation of the disclosure. In thisrespect, as used herein, the term “in” may include “in” and “on”, andthe terms “a”, “an” and “the” may include singular and pluralreferences. Furthermore, as used herein, the term “by” may also mean“from”, depending on the context. Furthermore, as used herein, the term“if” may also mean “when” or “upon”, depending on the context.Furthermore, as used herein, the words “and/or” may refer to andencompass any and all possible combinations of one or more of theassociated listed items.

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1 ). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1 , a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4 ), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1 , the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2 , optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2 . Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2 . Accordingly, sincethe extension line EL of the ray intersects the optical axis I on theobject side A1 of the lens element 200, periphery region Z2 is concave.In the lens element 200 illustrated in FIG. 2 , the first transitionpoint TP1 is the border of the optical axis region and the peripheryregion, i.e., TP1 is the point at which the shape changes from convex toconcave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex-(concave-) region,” can be usedalternatively.

FIG. 3 , FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3 , only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3 , since the shape of the optical axisregion Z1 is concave, the shape of the periphery region Z2 will beconvex as the shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4 , a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4 , theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5 , the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

In the present disclosure, examples of an optical imaging lens which maybe a prime lens are provided. Example embodiments of an optical imaginglens may comprise a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element. Each of thelens elements may comprise an object-side surface facing toward anobject side allowing imaging rays to pass through and an image-sidesurface facing toward an image side allowing the imaging rays to passthrough. These lens elements may be arranged sequentially from theobject side to the image side along an optical axis, and exampleembodiments of the lens may have refracting power of the optical imaginglens consist of the eight lens elements described above. Throughcontrolling shape of the surfaces and range of the parameters, theoptical imaging lens in example embodiments may achieve good imagingquality, effectively shorten the system length, reduce the f-numberand/or enlarge the field of view.

In some embodiments, the lens elements are designed in light of theoptical characteristics, system length, f-number, image height and/orfield of view of the optical imaging lens. For example, surface shapesof the concave periphery region of the object-side surface of the thirdlens element, the convex optical axis region of the image-side surfaceof the third lens element and the concave optical axis region of theobject-side surface of the eighth lens element, together with thenegative refracting power of the sixth lens element, it may bebeneficial to increase luminous flux of the whole optical imaging lensand present good imaging quality at the same time. Surface shapes of theconvex periphery region of the object-side surface of the second lenselement, the concave periphery region of the object-side surface of thethird lens element and the convex optical axis region of the image-sidesurface of the third lens element, together with the negative refractingpower of the sixth lens element and satisfying TTL/ImgH≤1.400, it may bebeneficial to shorten the system length and present a greater imageheight for the image sensor to receive more imaging rays and improveimaging quality eventually. Preferably, the optical imaging lens maysatisfy 1.000≤TTL/ImgH≤1.400. Surface shapes of the convex peripheryregion of the object-side surface of the second lens element, the convexoptical axis region of the image-side surface of the third lens elementand the concave optical axis region of the object-side surface of theeighth lens element, together with the positive refracting power of thefirst lens element, the negative refracting power of the second lenselement and the negative refracting power of the sixth lens element, itmay be beneficial to adjust the longitudinal spherical aberration, thecurvature of field in the sagittal and tangential directions, and reducethe distortion aberration of the optical imaging lens.

When the optical imaging lens further satisfies V1+V2+V6+V8≤160.000, itmay be beneficial to improve chromatical aberration; preferably, theoptical imaging lens may satisfy 145.000≤V1+V2+V6+V8≤160.000.

When the optical imaging lens further satisfies HFOV/TL≥5.200°/mm and/orHFOV/Fno≥20.000°, it may be beneficial to enlarge the field of viewangle; preferably, the optical imaging lens may satisfy5.200°/mm≤HFOV/TL≤11.000°/mm and/or 20.000°≤HFOV/Fno≤32.000°.

When the optical imaging lens further satisfies at least one of(T7+G78+T8)/(T1+G12+T2)≥1.200, (EFL+BFL)/AAG≤3.700, ALT/(T2+T8)≥4.800,(G45+G78)/(G23+G56+G67)≥1.000, ALT/(T4+G45+T5)≤4.500, AAG/(T6+T8)≤4.000,TL/(G45+G56+G78)≤5.300, AAG/(G12+G23+G34)≥3.300, TL/(T1+T3)≤5.800,EFL/(T5+BFL)≥2.000, EFL/(T1+T4+T6)≥2.000, (EFL+BFL)/(T2+T7)≥5.000,TL/(T5+G56+T6)≤6.100 and TL/BFL≥7.000, the thickness of the lenselements and/or the air gaps between the lens elements may be shortenedproperly to avoid any excessive value of the parameters which may beunfavorable and may thicken the system length of the whole system of theoptical imaging lens, and to avoid any insufficient value of theparameters which may increase the production difficulty of the opticalimaging lens. Preferably, the optical imaging lens may satisfy at leastone of 1.200≤(T7+G78+T8)/(T1+G12+T2)≤2.200, 2.000≤(EFL+BFL)/AAG≤3.700,4.800≤ALT/(T2+T8)≤15.000, 1.000≤(G45+G78)/(G23+G56+G67)≤4.700,1.800≤ALT/(T4+G45+T5)≤4.500, 1.600≤AAG/(T6+T8)≤4.000,3.000≤TL/(G45+G56+G78)≤5.300, 3.300≤AAG/(G12+G23+G34)≤5.000,3.200≤TL/(T1+T3)≤5.800, 2.000≤EFL/(T5+BFL)≤5.200,2.000≤EFL/(T1+T4+T6)≤4.400, 5.000≤(EFL+BFL)/(T2+T7)≤9.200,2.900≤TL/(T5+G56+T6)≤6.100 and 7.000≤TL/BFL≤15.000.

In light of the unpredictability in an optical system, satisfying theseinequalities listed above may result in shortening the system length ofthe optical imaging lens, lowering the f-number, enlarging the field ofview, promoting the imaging quality and/or increasing the yield in theassembly process in the present disclosure.

When implementing example embodiments, more details about the convex orconcave surface or refracting power could be incorporated for onespecific lens element or broadly for a plurality of lens elements toimprove the control for the system performance and/or resolution, orpromote the yield. For example, in an example embodiment, each lenselement may be made from all kinds of transparent material, such asglass, resin, etc. It is noted that the details listed here could beincorporated in example embodiments if no inconsistency occurs.

Several example embodiments and associated optical data will now beprovided for illustrating example embodiments of an optical imaging lenswith a short system length, good optical characteristics, a wide viewangle and/or a low f-number. Reference is now made to FIGS. 6-9 . FIG. 6illustrates an example cross-sectional view of an optical imaging lens 1having eight lens elements of the optical imaging lens according to afirst example embodiment. FIG. 7 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 1 according to an example embodiment. FIG. 8illustrates an example table of optical data of each lens element of theoptical imaging lens 1 according to an example embodiment. FIG. 9depicts an example table of aspherical data of the optical imaging lens1 according to an example embodiment.

As shown in FIG. 6 , the optical imaging lens 1 of the presentembodiment may comprise, in the order from an object side A1 to an imageside A2 along an optical axis, an aperture stop STO, a first lenselement L1, a second lens element L2, a third lens element L3, a fourthlens element L4, a fifth lens element L5, a sixth lens element L6, aseventh lens element L7 and an eighth lens element L8. A filtering unitTF and an image plane IMA of an image sensor may be positioned at theimage side A2 of the optical lens 1. Each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens element L1, L2, L3, L4,L5, L6, L7, L8 and the filtering unit TF may comprise an object-sidesurface L1A1/L2A1/L3A1/L4A1/L5A1/L6A1/L7A1/L8A1/TFA1 facing toward theobject side A1 and an image-side surfaceL1A2/L2A2/L3A2/L4A2/L5A2/L6A2/L7A2/L8A2/TFA2 facing toward the imageside A2. The filtering unit TF, positioned between the eighth lenselement L8 and the image plane IMA, may selectively absorb light withspecific wavelength(s) from the light passing through optical imaginglens 1. The example embodiment of the filtering unit TF which mayselectively absorb light with specific wavelength(s) from the lightpassing through optical imaging lens 1 may be an IR cut filter (infraredcut filter). Then, IR light may be absorbed, and this may prohibit theIR light, which might not be seen by human eyes, from producing an imageon the image plane IMA.

Example embodiments of each lens element of the optical imaging lens 1,which may be constructed by glass, plastic material or other transparentmaterial, will now be described with reference to the drawings.

An example embodiment of the first lens element L1, which may beconstructed by plastic material, may have positive refracting power. Onthe object-side surface L1A1, an optical axis region L1A1C may be convexand a periphery region L1A1P may be convex. On the image-side surfaceL1A2, an optical axis region L1A2C may be concave and a periphery regionL1A2P may be concave. Both the object-side surface L1A1 and theimage-side surface L1A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the second lens element L2, which may beconstructed by plastic material, may have negative refracting power. Onthe object-side surface L2A1, an optical axis region L2A1C may be convexand a periphery region L2A1P may be convex. On the image-side surfaceL2A2, an optical axis region L2A2C may be concave and a periphery regionL2A2P may be concave. Both the object-side surface L2A1 and theimage-side surface L2A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the third lens element L3, which may beconstructed by plastic material, may have positive refracting power. Onthe object-side surface L3A1, an optical axis region L3A1C may be convexand a periphery region L3A1P may be concave. On the image-side surfaceL3A2, an optical axis region L3A2C may be convex and a periphery regionL3A2P may be convex. Both the object-side surface L3A1 and theimage-side surface L3A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the fourth lens element L4, which may beconstructed by plastic material, may have positive refracting power. Onthe object-side surface L4A1, an optical axis region L4A1C may beconcave and a periphery region L4A1P may be concave. On the image-sidesurface L4A2, an optical axis region L4A2C may be convex and a peripheryregion L4A2P may be convex. Both the object-side surface L4A1 and theimage-side surface L4A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the fifth lens element L5, which may beconstructed by plastic material, may have positive refracting power. Onthe object-side surface L5A1, an optical axis region L5A1C may be convexand a periphery region L5A1P may be concave. On the image-side surfaceL5A2, an optical axis region L5A2C may be concave and a periphery regionL5A2P may be convex. Both the object-side surface L5A1 and theimage-side surface L5A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the sixth lens element L6, which may beconstructed by plastic material, may have negative refracting power. Onthe object-side surface L6A1, an optical axis region L6A1C may be convexand a periphery region L6A1P may be concave. On the image-side surfaceL6A2, an optical axis region L6A2C may be concave and a periphery regionL6A2P may be convex. Both the object-side surface L6A1 and theimage-side surface L6A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the seventh lens element L7, which may beconstructed by plastic material, may have positive refracting power. Onthe object-side surface L7A1, an optical axis region L7A1C may be convexand a periphery region L7A1P may be concave. On the image-side surfaceL7A2, an optical axis region L7A2C may be convex and a periphery regionL7A2P may be convex. Both the object-side surface L7A1 and theimage-side surface L7A2 of the optical imaging lens 1 are asphericalsurfaces.

An example embodiment of the eighth lens element L8, which may beconstructed by plastic material, may have negative refracting power. Onthe object-side surface L8A1, an optical axis region L8A1C may beconcave and a periphery region L8A1P may be convex. On the image-sidesurface L8A2, an optical axis region L8A2C may be concave and aperiphery region L8A2P may be convex. Both the object-side surface L8A1and the image-side surface L8A2 of the optical imaging lens 1 areaspherical surfaces.

In example embodiments, air gaps may exist between each pair of adjacentlens elements, as well as between the eighth lens element L8 and thefiltering unit TF, and the filtering unit TF and the image plane IMA ofthe image sensor. Please note, in other embodiments, any of theaforementioned air gaps may or may not exist. For example, profiles ofopposite surfaces of a pair of adjacent lens elements may align withand/or attach to each other, and in such situations, the air gap mightnot exist.

FIG. 8 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment. Please also refer toFIG. 46C for the values of TTL/ImgH, V1+V2+V6+V8, HFOV/TL,(T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG, ALT/(T2+T8),(G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8), HFOV/Fno,TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFLcorresponding to the present embodiment.

The totaled 16 aspherical surfaces, including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7 and the object-side surfaceL8A1 and the image-side surface L8A2 of the eighth lens element L8 mayall be defined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{1} \times Y^{i}}}}$wherein, Y represents the perpendicular distance between the point ofthe aspherical surface and the optical axis; Z represents the depth ofthe aspherical surface (the perpendicular distance between the point ofthe aspherical surface at a distance Y from the optical axis and thetangent plane of the vertex on the optical axis of the asphericalsurface); R represents the radius of curvature of the surface of thelens element; K represents a conic constant; a_(i) represents anaspherical coefficient of i^(th) level. The values of each asphericalparameter are shown in FIG. 9 .

Referring to FIG. 7(a), a longitudinal spherical aberration of theoptical imaging lens in the present embodiment is shown in coordinatesin which the horizontal axis represents focus and the vertical axisrepresents field of view, and FIG. 7(b), curvature of field of theoptical imaging lens in the present embodiment in the sagittal directionis shown in coordinates in which the horizontal axis represents focusand the vertical axis represents image height, and FIG. 7(c), curvatureof field in the tangential direction of the optical imaging lens in thepresent embodiment is shown in coordinates in which the horizontal axisrepresents curvature of field and the vertical axis represents imageheight, and FIG. 7(d), distortion aberration of the optical imaging lensin the present embodiment is shown in coordinates in which thehorizontal axis represents percentage and the vertical axis representsimage height.

The curves of different wavelengths (470 nm, 555 nm, 650 nm) may beclose to each other. This represents that off-axis light with respect tothese wavelengths may be focused around an image point. From thevertical deviation of each curve shown therein, the offset of theoff-axis light relative to the image point may be within −0.08˜0.02 mm.Therefore, the present embodiment may improve the longitudinal sphericalaberration with respect to different wavelengths. For curvature of fieldin the sagittal direction, the focus variation with respect to the threewavelengths in the whole field may fall within −0.08˜0.02 mm, forcurvature of field in the tangential direction, the focus variation withrespect to the three wavelengths in the whole field may fall within−0.12˜0.16 mm, and the variation of the distortion aberration may bewithin 0˜6%.

According to the values of the aberrations, it is shown that the opticalimaging lens 1 of the present embodiment, with the HFOV as large as47.000 degrees, Fno as small as 1.599, image height as great as 4.705mm, and the system length as short as 5.532 mm, may be capable ofproviding good imaging quality as well as good optical characteristics.

Reference is now made to FIGS. 10-13 . FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having eight lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 11 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment.

As shown in FIG. 10 , the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the second embodiment and the first embodimentmay include the radius of curvature, thickness of each lens element, thevalue of each air gap, aspherical data, related optical parameters, suchas back focal length, and the configuration of the concave/convex shapeof the image-side surface L7A2 and the negative refracting power of thefourth lens element L4; but the configuration of the concave/convexshape of surfaces, comprising the object-side surfaces L1A1, L2A1, L3A1,L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the object side A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2 and L8A2 facingto the image side A2, and positive or negative configuration of therefracting power of the lens element other than the fourth lens elementL4 may be similar to those in the first embodiment. Here and in theembodiments hereinafter, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Specifically, the differences ofconfiguration of surface shape may include: an optical axis region L7A2Con the image-side surface L7A2 of the seventh lens element L7 may beconcave. Please refer to FIG. 12 for the optical characteristics of eachlens elements in the optical imaging lens 2 of the present embodiment,and please refer to FIG. 46C for the values of TTL/ImgH, V1+V2+V6+V8,HFOV/TL, (T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG, ALT/(T2+T8),(G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8), HFOV/Fno,TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 11(a), the offsetof the off-axis light relative to the image point may be within−0.07˜0.02 mm. As the curvature of field in the sagittal direction shownin FIG. 11(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.08˜0.02 mm. As the curvature offield in the tangential direction shown in FIG. 11(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.14˜0.12 mm. As shown in FIG. 11(d), the variation of thedistortion aberration may be within −0.5˜4.5%. Compared with the firstembodiment, the longitudinal spherical and the distortion aberration maybe smaller in the present embodiment.

According to the value of the aberrations, it is shown that the opticalimaging lens 2 of the present embodiment, with the HFOV as large as47.000 degrees, Fno as small as 1.599, image height as great as 4.706 mmand the system length as short as 5.535 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the imageheight may be greater in the present embodiment.

Reference is now made to FIGS. 14-17 . FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having eight lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 15 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 16 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 17 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment.

As shown in FIG. 14 , the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprises an aperture stop STO, first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the third embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, and the configuration of the concave/convexshape of the object-side surface L5A1 and the image-side surfaces L5A2,L7A2; but the configuration of the concave/convex shape of surfaces,comprising the object-side surfaces L1A1, L2A1, L3A1, L4A1, L6A1, L7A1and L8A1 facing to the object side A1 and the image-side surfaces L1A2,L2A2, L3A2, L4A2, L6A2 and L8A2 facing to the image side A2, andpositive or negative configuration of the refracting power of each lenselement may be similar to those in the first embodiment. Specifically,the differences of configuration of surface shape may include: anoptical axis region L5A1C on the object-side surface L5A1 of the fifthlens element L5 may be concave, an optical axis region L5A2C on theimage-side surface L5A2 of the fifth lens element L5 may be convex, andan optical axis region L7A2C on the image-side surface L7A2 of theseventh lens element L7 may be concave. Please refer to FIG. 16 for theoptical characteristics of each lens elements in the optical imaginglens 3 of the present embodiment, and please refer to FIG. 46C for thevalues of TTL/ImgH, V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2),(EFL+BFL)/AAG, ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5),AAG/(T6+T8), HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3),EFL/(T5+BFL), EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) andTL/BFL of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 15(a), the offsetof the off-axis light relative to the image point may be within−0.03˜0.015 mm. As the curvature of field in the sagittal directionshown in FIG. 15(b), the focus variation with regard to the threewavelengths in the whole field may fall within −0.1˜0.1 mm. As thecurvature of field in the tangential direction shown in FIG. 15(c), thefocus variation with regard to the three wavelengths in the whole fieldmay fall within −1˜0.1 mm. As shown in FIG. 15(d), the variation of thedistortion aberration may be within −9˜3%. Compared with the firstembodiment, the longitudinal spherical aberration may be smaller in thepresent embodiment.

According to the value of the aberrations, it is shown that the opticalimaging lens 3 of the present embodiment, with the HFOV as large as47.000 degrees, Fno as small as 1.599, image height as great as 3.935 mmand the system length as short as 5.361 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the systemlength of the optical imaging lens 3 in the present embodiment may beshorter.

Reference is now made to FIGS. 18-21 . FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having eight lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 19 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 20 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment.

As shown in FIG. 18 , the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the fourth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, and the configuration of the concave/convexshape of the image-side surfaces L5A2, L7A2 and the negative refractingpower of the fourth lens element L4; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the objectside A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L6A2 andL8A2 facing to the image side A2, and positive or negative configurationof the refracting power of the lens element other than the fourth lenselement L4 may be similar to those in the first embodiment.Specifically, an optical axis region L5A2C on the image-side surfaceL5A2 of the fifth lens element L5 may be convex, and an optical axisregion L7A2C on the image-side surface L7A2 of the seventh lens elementL7 may be concave. Please refer to FIG. 20 for the opticalcharacteristics of each lens elements in the optical imaging lens 4 ofthe present embodiment, please refer to FIG. 46C for the values ofTTL/ImgH, V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG,ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8),HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 19(a), the offsetof the off-axis light relative to the image point may be within−0.25˜0.05 mm. As the curvature of field in the sagittal direction shownin FIG. 19(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.25˜0.05 mm. As the curvature offield in the tangential direction shown in FIG. 19(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.3˜0.1 mm. As shown in FIG. 19(d), the variation of thedistortion aberration may be within −6˜3%.

According to the value of the aberrations, it is shown that the opticalimaging lens 4 of the present embodiment, with the HFOV as large as47.000 degrees, Fno as small as 1.599, image height as great as 4.229 mmand the system length as short as 5.716 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the yield maybe greater in the present embodiment.

Reference is now made to FIGS. 22-25 . FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having eight lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 23 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment.

As shown in FIG. 22 , the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the fifth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surface L8A1 and the image-side surface L7A2 and thenegative refracting power of the fourth lens element L4; but theconfiguration of the concave/convex shape of surfaces, comprising theobject-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1 and L7A1 facingto the object side A1 and the image-side surfaces L1A2, L2A2, L3A2,L4A2, L5A2, L6A2 and L8A2 facing to the image side A2, and positive ornegative configuration of the refracting power of the lens element otherthan the fourth lens element L4 may be similar to those in the firstembodiment. Specifically, an optical axis region L7A2C on the image-sidesurface L7A2 of the seventh lens element L7 may be concave, and aperipheral region L8A1P on the object-side surface L8A1 of the eighthlens element L8 may be concave. Please refer to FIG. 24 for the opticalcharacteristics of each lens elements in the optical imaging lens 5 ofthe present embodiment, please refer to FIG. 46C for the values ofTTL/ImgH, V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG,ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8),HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 23(a), the offsetof the off-axis light relative to the image point may be within−0.02˜0.08 mm. As the curvature of field in the sagittal direction shownin FIG. 23(b), the focus variation with regard to the three wavelengthsin the whole field may fall within 0.01˜0.08 mm. As the curvature offield in the tangential direction shown in FIG. 23(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.03˜0.08 mm. As shown in FIG. 23(d), the variation of thedistortion aberration may be within −0.8˜0.2%. Compared with the firstembodiment, the curvature of field in the tangential direction and thedistortion aberration may be smaller in the present embodiment.

According to the value of the aberrations, it is shown that the opticalimaging lens 5 of the present embodiment, with the HFOV as large as40.000 degrees, Fno as small as 1.999, image height as great as 4.118 mmand the system length as short as 5.761 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the yield maybe greater in the present embodiment.

Reference is now made to FIGS. 26-29 . FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having eight lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 27 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 28 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment.

As shown in FIG. 26 , the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the sixth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surface L3A1 and the image-side surfaces L7A2, L8A2,the negative refracting power of the fourth lens element L4, thenegative refracting power of the fifth lens element L5 and the positiverefracting power of the eighth lens element L8; but the configuration ofthe concave/convex shape of surfaces, comprising the object-sidesurfaces L1A1, L2A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to theobject side A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2and L6A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of the lens element other than thefourth lens element L4, the fifth lens element L5 and the eighth lenselement L8 may be similar to those in the first embodiment.Specifically, an optical axis region L3A1C on the object-side surfaceL3A1 of the third lens element L3 may be concave, an optical axis regionL7A2C on the image-side surface L7A2 of the seventh lens element L7 maybe concave, and an optical axis region L8A2C on the image-side surfaceL8A2 of the eighth lens element L8 may be convex. Please refer to FIG.28 for the optical characteristics of each lens elements in the opticalimaging lens 6 of the present embodiment, please refer to FIG. 46D forthe values of TTL/ImgH, V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2),(EFL+BFL)/AAG, ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5),AAG/(T6+T8), HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3),EFL/(T5+BFL), EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) andTL/BFL of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 27(a), the offsetof the off-axis light relative to the image point may be within−0.02˜0.025 mm. As the curvature of field in the sagittal directionshown in FIG. 27(b), the focus variation with regard to the threewavelengths in the whole field may fall within −1˜8 mm. As the curvatureof field in the tangential direction shown in FIG. 27(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −1˜8 mm. As shown in FIG. 27(d), the variation of thedistortion aberration may be within −30˜10%.

According to the value of the aberrations, it is shown that the opticalimaging lens 6 of the present embodiment, with the HFOV as large as43.000 degrees, Fno as small as 1.800, image height as great as 4.078 mmand the system length as short as 5.693 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the yield maybe greater in the present embodiment.

Reference is now made to FIGS. 30-33 . FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having eight lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 31 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 32 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 33 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment.

As shown in FIG. 30 , the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the seventh embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surfaces L4A1, L5A1, L6A1, L8A1 and the image-sidesurfaces L4A2, L5A2, L6A2, L7A2, the negative refracting power of thefourth lens element L4 and the negative refracting power of the fifthlens element L5; but the configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces L1A1, L2A1, L3A1 and L7A1facing to the object side A1 and the image-side surfaces L1A2, L2A2,L3A2 and L8A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of the lens element other than thefourth lens element L4 and the fifth lens element L5 may be similar tothose in the first embodiment. Specifically, an optical axis regionL4A1C on the object-side surface L4A1 of the fourth lens element L4 maybe convex, an optical axis region L4A2C on the image-side surface L4A2of the fourth lens element L4 may be concave, an optical axis regionL5A1C on the object-side surface L5A1 of the fifth lens element L5 maybe concave, an optical axis region L5A2C on the image-side surface L5A2of the fifth lens element L5 may be convex, an optical axis region L6A1Con the object-side surface L6A1 of the sixth lens element L6 may beconcave, an optical axis region L6A2C on the image-side surface L6A2 ofthe sixth lens element L6 may be convex, an optical axis region L7A2C onthe image-side surface L7A2 of the seventh lens element L7 may beconcave, and a peripheral region L8A1P on the object-side surface L8A1of the eighth lens element L8 may be concave. Please refer to FIG. 32for the optical characteristics of each lens elements in the opticalimaging lens 7 of the present embodiment, please refer to FIG. 46D forthe values of TTL/ImgH, V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2),(EFL+BFL)/AAG, ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5),AAG/(T6+T8), HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3),EFL/(T5+BFL), EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) andTL/BFL of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 31(a), the offsetof the off-axis light relative to the image point may be within−0.12˜0.02 mm. As the curvature of field in the sagittal direction shownin FIG. 31(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.15˜0.1 mm. As the curvature offield in the tangential direction shown in FIG. 31(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.15˜0.3 mm. As shown in FIG. 31(d), the variation of thedistortion aberration may be within 0˜35%.

According to the value of the aberrations, it is shown that the opticalimaging lens 7 of the present embodiment, with the HFOV as large as36.200 degrees, Fno as small as 1.599, image height as great as 5.333 mmand the system length as short as 7.460 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the imageheight may be greater in the present embodiment.

Reference is now made to FIGS. 34-37 . FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having eight lenselements of the optical imaging lens according to an eighth exampleembodiment. FIG. 35 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 8 according to the eighth embodiment. FIG. 36 shows an exampletable of optical data of each lens element of the optical imaging lens 8according to the eighth example embodiment. FIG. 37 shows an exampletable of aspherical data of the optical imaging lens 8 according to theeighth example embodiment.

As shown in FIG. 34 , the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the eighth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surface L5A1 and the image-side surfaces L1A2, L4A2,L5A2, the negative refracting power of the fourth lens element L4, andthe negative refracting power of the fifth lens element L5; but theconfiguration of the concave/convex shape of surfaces comprising theobject-side surfaces L1A1, L2A1, L3A1, L4A1, L6A1, L7A1 and L8A1 facingto the object side A1 and the image-side surfaces L2A2, L3A2, L6A2, L7A2and L8A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of the lens element other than thefourth lens element L4 and the fifth lens element L5 may be similar tothose in the first embodiment. Specifically, the differences ofconfiguration of surface shape may include: a periphery region L1A2P onthe image-side surface L1A2 of the first lens element L1 may be convex,an optical axis region L4A2C on the image-side surface L4A2 of thefourth lens element L4 may be concave, an optical axis region L5A1C onthe object-side surface L5A1 of the fifth lens element L5 may beconcave, and an optical axis region L5A2C on the image-side surface L5A2of the fifth lens element L5 may be convex. Please refer to FIG. 36 forthe optical characteristics of each lens elements in the optical imaginglens 8 of the present embodiment, and please refer to FIG. 46D for thevalues of TTL/ImgH, V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2),(EFL+BFL)/AAG, ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5),AAG/(T6+T8), HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3),EFL/(T5+BFL), EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) andTL/BFL of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 35(a), the offsetof the off-axis light relative to the image point may be within−0.05˜0.015 mm. As the curvature of field in the sagittal directionshown in FIG. 35(b), the focus variation with regard to the threewavelengths in the whole field may fall within −0.06˜0.02 mm. As thecurvature of field in the tangential direction shown in FIG. 35(c), thefocus variation with regard to the three wavelengths in the whole fieldmay fall within −0.18˜0.04 mm. As shown in FIG. 35(D), the variation ofthe distortion aberration may be within −4˜5%. Compared with the firstembodiment, the longitudinal spherical aberration and the curvature offield in the sagittal direction may be smaller here.

According to the value of the aberrations, it is shown that the opticalimaging lens 8 of the present embodiment, with the HFOV as large as45.693 degrees, Fno as small as 1.599, image height as great as 3.683 mmand the system length as short as 5.153 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the systemlength of the optical imaging lens 8 in the present embodiment may beshorter.

Reference is now made to FIGS. 38-41 . FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 having eight lenselements of the optical imaging lens according to a ninth exampleembodiment. FIG. 39 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 9 according to the ninth embodiment. FIG. 40 shows an example tableof optical data of each lens element of the optical imaging lens 9according to the ninth example embodiment. FIG. 41 shows an exampletable of aspherical data of the optical imaging lens 9 according to theninth example embodiment.

As shown in FIG. 38 , the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the ninth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surfaces L5A1, L6A1 and the image-side surfaces L5A2,L6A2, L7A2, and the negative refracting power of the seventh lenselement L7; but the configuration of the concave/convex shape ofsurfaces comprising the object-side surfaces L1A1, L2A1, L3A1, L4A1,L7A1 and L8A1 facing to the object side A1 and the image-side surfacesL1A2, L2A2, L3A2, L4A2 and L8A2 facing to the image side A2, andpositive or negative configuration of the refracting power of the lenselement other than the seventh lens element L7 may be similar to thosein the first embodiment. Specifically, the differences of configurationof surface shape may include: an optical axis region L5A1C on theobject-side surface L5A1 of the fifth lens element L5 may be concave, anoptical axis region L5A2C on the image-side surface L5A2 of the fifthlens element L5 may be convex, an optical axis region L6A1C on theobject-side surface L6A1 of the sixth lens element L6 may be concave, anoptical axis region L6A2C on the image-side surface L6A2 of the sixthlens element L6 may be convex, and an optical axis region L7A2C on theimage-side surface L7A2 of the seventh lens element L7 may be concave.Please refer to FIG. 40 for the optical characteristics of each lenselements in the optical imaging lens 9 of the present embodiment, pleaserefer to FIG. 46D for the values of TTL/ImgH, V1+V2+V6+V8, HFOV/TL,(T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG, ALT/(T2+T8),(G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8), HFOV/Fno,TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 39(a), the offsetof the off-axis light relative to the image point may be within−0.035˜0.03 mm. As the curvature of field in the sagittal directionshown in FIG. 39(b), the focus variation with regard to the threewavelengths in the whole field may fall within −0.06˜0.01 mm. As thecurvature of field in the tangential direction shown in FIG. 39(c), thefocus variation with regard to the three wavelengths in the whole fieldmay fall within −0.07˜0.06 mm. As shown in FIG. 39(d), the variation ofthe distortion aberration may be within −10˜3%. Compared with the firstembodiment, the curvature of field in both the sagittal and tangentialdirections may be smaller here.

According to the value of the aberrations, it is shown that the opticalimaging lens 9 of the present embodiment, with the HFOV as large as45.693 degrees, Fno as small as 1.599, the image height as great as3.734 mm and the system length as short as 5.221 mm, may be capable ofproviding good imaging quality. Compared with the first embodiment, thesystem length of the optical imaging lens 9 in the present embodimentmay be shorter.

Reference is now made to FIGS. 42-45 . FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10 having eight lenselements of the optical imaging lens according to a tenth exampleembodiment. FIG. 43 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 10 according to the tenth embodiment. FIG. 44 shows an exampletable of optical data of each lens element of the optical imaging lens10 according to the tenth example embodiment. FIG. 45 shows an exampletable of aspherical data of the optical imaging lens 10 according to thetenth example embodiment.

As shown in FIG. 42 , the optical imaging lens 10 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the tenth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surfaces L3A1, L4A1 and the image-side surfaces L4A2,L5A2, L7A2, the negative refracting power of the third lens element L3,and the negative refracting power of the fourth lens element L4; but theconfiguration of the concave/convex shape of surfaces comprising theobject-side surfaces L1A1, L2A1, L5A1, L6A1, L7A1 and L8A1 facing to theobject side A1 and the image-side surfaces L1A2, L2A2, L3A2, L6A2 andL8A2 facing to the image side A2, and positive or negative configurationof the refracting power of the lens element other than the third lenselement L3 and the fourth lens element L4 may be similar to those in thefirst embodiment. Specifically, the differences of configuration ofsurface shape may include: an optical axis region L3A1C on theobject-side surface L3A1 of the third lens element L3 may be concave, anoptical axis region L4A1C on the object-side surface L4A1 of the fourthlens element L4 may be convex, an optical axis region L4A2C on theimage-side surface L4A2 of the fourth lens element L4 may be concave, anoptical axis region L5A2C on the image-side surface L5A2 of the fifthlens element L5 may be convex, and an optical axis region L7A2C on theimage-side surface L7A2 of the seventh lens element L7 may be concave.Please refer to FIG. 44 for the optical characteristics of each lenselements in the optical imaging lens 10 of the present embodiment, andplease refer to FIG. 46D for the values of TTL/ImgH, V1+V2+V6+V8,HFOV/TL, (T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG, ALT/(T2+T8),(G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8), HFOV/Fno,TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 43(a), the offsetof the off-axis light relative to the image point may be within−0.08˜0.03 mm. As the curvature of field in the sagittal direction shownin FIG. 43(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.1˜0.05 mm. As the curvature offield in the tangential direction shown in FIG. 43(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.3˜0.1 mm. As shown in FIG. 43(d), the variation of thedistortion aberration may be within −7˜2%.

According to the value of the aberrations, it is shown that the opticalimaging lens 10 of the present embodiment, with the HFOV as large as45.693 degrees, Fno as small as 1.599, image height as great as 3.822 mmand the system length as short as 5.283 mm, may be capable of providinggood imaging quality. Compared with the first embodiment, the systemlength of the optical imaging lens 10 in the present embodiment may beshorter.

Please refer to FIGS. 46C and 46D for the values of TTL/ImgH,V1+V2+V6+V8, HFOV/TL, (T7+G78+T8)/(T1+G12+T2), (EFL+BFL)/AAG,ALT/(T2+T8), (G45+G78)/(G23+G56+G67), ALT/(T4+G45+T5), AAG/(T6+T8),HFOV/Fno, TL/(G45+G56+G78), AAG/(G12+G23+G34), TL/(T1+T3), EFL/(T5+BFL),EFL/(T1+T4+T6), (EFL+BFL)/(T2+T7), TL/(T5+G56+T6) and TL/BFL of all tenembodiments, and the optical imaging lens of the present disclosure maysatisfy at least one of the Inequality (1) and/or Inequalities (2)˜(18).Further, any range of which the upper and lower limits defined by thevalues disclosed in all of the embodiments herein may be implemented inthe present embodiments.

According to above illustration, the longitudinal spherical aberration,curvature of field in both the sagittal direction and tangentialdirection and distortion aberration in all embodiments may meet the userrequirement of a related product in the market. The off-axis light withregard to three different wavelengths (470 nm, 555 nm, 650 nm) may befocused around an image point and the offset of the off-axis lightrelative to the image point may be well controlled with suppression forthe longitudinal spherical aberration, curvature of field both in thesagittal direction and tangential direction and distortion aberration.The curves of different wavelengths may be close to each other, and thisrepresents that the focusing for light having different wavelengths maybe good to suppress chromatic dispersion. In summary, lens elements aredesigned and matched for achieving good imaging quality.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof example embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages. Further, all of the numerical ranges including the maximumand minimum values and the values therebetween which are obtained fromthe combining proportion relation of the optical parameters disclosed ineach embodiment of the present disclosure are implementable.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, comprising a firstelement, a second element, a third element, a fourth element, a fifthlens element, a sixth lens element, a seventh lens element and an eighthlens element sequentially from an object side to an image side along anoptical axis, each of the first, second, third, fourth, fifth, sixth,seventh and eighth lens element having an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through, wherein: a periphery region of the object-sidesurface of the second lens element is convex; a periphery region of theobject-side surface of the third lens element is concave and an opticalaxis region of the image-side surface of the third lens element isconvex; the sixth lens element has negative refracting power; lenselements having refracting power of the optical imaging lens consist ofthe eight lens elements described above; a thickness of the third lenselement along the optical axis is greater than either a distance fromthe image-side surface of the second lens element to the object-sidesurface of the third lens element along the optical axis or a distancefrom the image-side surface of the fifth lens element to the object-sidesurface of the sixth lens element along the optical axis; and a distancefrom the object-side surface of the first lens element to an image planealong the optical axis is represented by TTL, an image height of theoptical imaging lens is represented by ImgH, and the optical imaginglens satisfies the inequality:TTL/ImgH≤1.400.
 2. The optical imaging lens according to claim 1,wherein a sum of the thicknesses of all eight lens elements along theoptical axis is represented by ALT, a thickness of the fourth lenselement along the optical axis is represented by T4, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis is represented by G45,a thickness of the fifth lens element along the optical axis isrepresented by T5, and ALT, T4, G45 and T5 satisfy the inequality:ALT/(T4+G45+T5)≤4.500.
 3. The optical imaging lens according to claim 1,wherein a sum of seven air gaps from the first lens element to theeighth lens element along the optical axis is represented by AAG, athickness of the sixth lens element along the optical axis isrepresented by T6, a thickness of the eighth lens element along theoptical axis is represented by T8, and AAG, T6 and T8 satisfy theinequality:AAG/(T6+T8)≤4.000.
 4. The optical imaging lens according to claim 1,wherein a half field of view of the optical imaging lens is representedby HFOV, a f-number of the optical imaging lens is represented by Fno,and HFOV and Fno satisfy the inequality:HFOV/Fno≥20.000°.
 5. The optical imaging lens according to claim 1,wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis is represented by G45, adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis isrepresented by G56, a distance from the image-side surface of theseventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by G78, and TL, G45, G56and G78 satisfy the inequality:TL/(G45+G56+G78)≤5.300.
 6. The optical imaging lens according to claim1, wherein a sum of seven air gaps from the first lens element to theeighth lens element along the optical axis is represented by AAG, adistance from the image-side surface of the first lens element to theobject-side surface of the second lens element along the optical axis isrepresented by G12, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis is represented by G23, a distance from the image-sidesurface of the third lens element to the object-side surface of thefourth lens element along the optical axis is represented by G34, andAAG, G12, G23 and G34 satisfy the inequality:AAG/(G12+G23+G34)≥3.300.
 7. The optical imaging lens according to claim1, wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a thickness of the first lens elementalong the optical axis is represented by T1, a thickness of the thirdlens element along the optical axis is represented by T3, and TL, T1 andT3 satisfy the inequality:TL/(T1+T3)≤5.800.
 8. An optical imaging lens, comprising a firstelement, a second element, a third element, a fourth element, a fifthlens element, a sixth lens element, a seventh lens element and an eighthlens element sequentially from an object side to an image side along anoptical axis, each of the first, second, third, fourth, fifth, sixth,seventh and eighth lens element having an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through, wherein: a periphery region of the object-sidesurface of the second lens element is convex; a periphery region of theobject-side surface of the third lens element is concave and an opticalaxis region of the image-side surface of the third lens element isconvex; the sixth lens element has negative refracting power; an opticalaxis region of the object-side surface of the eighth lens element isconcave; lens elements having refracting power of the optical imaginglens consist of the eight lens elements described above; and a thicknessof the third lens element along the optical axis is greater than eithera distance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis ora distance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis;and a distance from the object-side surface of the first lens element toan image plane along the optical axis is represented by TTL, an imageheight of the optical imaging lens is represented by ImgH, and theoptical imaging lens satisfies the inequality:TTL/ImgH≤1.400.
 9. The optical imaging lens according to claim 8,wherein an abbe number of the first lens element is represented by V1,an abbe number of the second lens element is represented by V2, an abbenumber of the sixth lens element is represented by V6, an abbe number ofthe eighth lens element is represented by V8, and V1, V2, V6 and V8satisfy the inequality:V1+V2+V6+V8≤160.000.
 10. The optical imaging lens according to claim 8,wherein a thickness of the seventh lens element along the optical axisis represented by T7, a distance from the image-side surface of theseventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by G78, a thickness of theeighth lens element along the optical axis is represented by T8, athickness of the first lens element along the optical axis isrepresented by T1, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis is represented by G12, a thickness of the second lenselement along the optical axis is represented by T2, and T7, G78, T8,T1, G12 and T2 satisfy the inequality:(T7+G78+T8)/(T1+G12+T2)≥1.200.
 11. The optical imaging lens according toclaim 8, wherein an effective focal length of the optical imaging lensis represented by EFL, a distance from the image-side surface of theeighth lens element to an image plane along the optical axis isrepresented by BFL, a sum of seven air gaps from the first lens elementto the eighth lens element along the optical axis is represented by AAG,and EFL, BFL and AAG satisfy the inequality:(EFL+BFL)/AAG≤3.700.
 12. The optical imaging lens according to claim 8,wherein a sum of the thicknesses of all eight lens elements along theoptical axis is represented by ALT, a thickness of the second lenselement along the optical axis is represented by T2, a thickness of theeighth lens element along the optical axis is represented by T8, andALT, T2 and T8 satisfy the inequality:ALT/(T2+T8)≥4.800.
 13. The optical imaging lens according to claim 8,wherein a distance from the image-side surface of the fourth lenselement to the object-side surface of the fifth lens element along theoptical axis is represented by G45, a distance from the image-sidesurface of the seventh lens element to the object-side surface of theeighth lens element along the optical axis is represented by G78, adistance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis isrepresented by G23, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis is represented by G56, a distance from the image-sidesurface of the sixth lens element to the object-side surface of theseventh lens element along the optical axis is represented by G67, andG45, G78, G23, G56 and G67 satisfy the inequality:(G45+G78)/(G23+G56+G67)≥1.000.
 14. An optical imaging lens, comprising afirst element, a second element, a third element, a fourth element, afifth lens element, a sixth lens element, a seventh lens element and aneighth lens element sequentially from an object side to an image sidealong an optical axis, each of the first, second, third, fourth, fifth,sixth, seventh and eighth lens element having an object-side surfacefacing toward the object side and allowing imaging rays to pass throughand an image-side surface facing toward the image side and allowing theimaging rays to pass through, wherein: the first lens element haspositive refracting power; the second lens element has negativerefracting power and a periphery region of the object-side surface ofthe second lens element is convex; a periphery region of the object-sidesurface of the third lens element is concave and an optical axis regionof the image-side surface of the third lens element is convex; the sixthlens element has negative refracting power; an optical axis region ofthe object-side surface of the eighth lens element is concave; lenselements having refracting power of the optical imaging lens consist ofthe eight lens elements described above; and a thickness of the thirdlens element along the optical axis is greater than either a distancefrom the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis ora distance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis;and a distance from the object-side surface of the first lens element toan image plane along the optical axis is represented by TTL, an imageheight of the optical imaging lens is represented by ImgH, and theoptical imaging lens satisfies the inequality:TTL/ImgH≤1.400.
 15. The optical imaging lens according to claim 14,wherein an effective focal length of the optical imaging lens isrepresented by EFL, a thickness of the fifth lens element along theoptical axis is represented by T5, a distance from the image-sidesurface of the eighth lens element to an image plane along the opticalaxis is represented by BFL, and EFL, T7 and BFL satisfy the inequality:EFL/(T5+BFL)≥2.000.
 16. The optical imaging lens according to claim 14,wherein an effective focal length of the optical imaging lens isrepresented by EFL, a thickness of the first lens element along theoptical axis is represented by T1, a thickness of the fourth lenselement along the optical axis is represented by T4, a thickness of thesixth lens element along the optical axis is represented by T6, and EFL,T1, T4 and T6 satisfy the inequality:EFL/(T1+T4+T6)≥2.000.
 17. The optical imaging lens according to claim14, wherein an effective focal length of the optical imaging lens isrepresented by EFL, a distance from the image-side surface of the eighthlens element to an image plane along the optical axis is represented byBFL, a thickness of the second lens element along the optical axis isrepresented by T2, a thickness of the seventh lens element along theoptical axis is represented by T7, and EFL, BFL, T2 and T7 satisfy theinequality:(EFL+BFL)/(T2+T7)≥5.000.
 18. The optical imaging lens according to claim14, wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a thickness of the fifth lens elementalong the optical axis is represented by T5, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis is represented by G56,a thickness of the sixth lens element along the optical axis isrepresented by T6, and TL, T5, G56 and T6 satisfy the inequality:TL/(T5+G56+T6)≤6.100.
 19. The optical imaging lens according to claim14, wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a distance from the image-sidesurface of the eighth lens element to an image plane along the opticalaxis is represented by BFL, and TL and BFL satisfy the inequality:TL/BFL≥7.000.
 20. The optical imaging lens according to claim 8, whereina half field of view of the optical imaging lens is represented by HFOV,a distance from the object-side surface of the first lens element to theimage-side surface of the eighth lens element along the optical axis isrepresented by TL, and HFOV and TL satisfy the inequality:HFOV/TL≥5.200°/mm.